The Hybrid Power Battery Pack XP is a durable portable lithium ion battery pack designed to replace a portable generator. The XP model also includes a high surge capacity, which is ideal for running different large tools on the unit. 4000W continuous rated output, with surge up to 8000W for 1 second. 3.6kWh battery capacity. Expected 10-15 years operation, or 3000 Cycles. Recharge time at wall is 4.5 hours and charge time at max solar is 8 hours. Maximum solar charging is 800W and up to 75Vdc. This kit includes Solar PV and Wall charging options, and the cold weather kit to charge in temperatures between -20°C to +40°C. Solar PV panels not included. Other options available upon request; ask about the alternator charging option.